Front, about 23mm, rear, 11mm. Be aware that machining rotors is a short term solution. It's more cost effective (ie labour) to replace with new rotors and pads.
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Each brake rotor has the minimum thickness marked on the rotor. Keep in mind also that the comparative thickness of each side of a vented rotor must be considered. Even if the overall thickness is greater than the minimum, each side must be within .040" (1mm) of the other.
The minimum rotor thickness is normally cast into the rotor. You will find it printed either on the outside hat section of the rotor or on the very top edge section of the rotor.
There are some example pictures here
Most rotors won't make it past one set of pads for thickness. If they are smooth and not warp(pedal or steering wheel shakes when braking), Reuse them. Using this theory you can get up to 3 sets of pads off the rotors. The minimum thickness is stamped on the edge of the rotors.
FRONT BRAKE ROTORS:
Discard Thickness30.7 mm (1.209 in.)
Lateral Runout (New)0.06 mm (0.002 in.)
Minimum Thickness after Refinish31.08 mm (1.224 in.)
Rotor Diameter 15 inch Wheels (New)278.0 mm (10.9 in.)
Rotor Diameter 16 inch Wheels (New)303.0 mm (11.9 in.)
Rotor Thickness (New)32.20 mm (1.267 in.)
Thickness Variation (New)0.025 mm (0.001 in.)
ON most disc rotors the minimum thickness is cast into the body of the rotor and will read min thickness and a dimension. The dimension is also available in the workshop manuals and from the service department of your vehicle. Do not be surprised if you find that your dimensions are almost at do not machine limits as original rotors are not much thicker than the low limit.
All are different, on the back side of the brake rotor , will have a stamp with (MIN) and some number after it the will be the minimum spec thickness for the brake rotor.
there is many kind of brake system of ur truck here i will send u everything about the brake and i hope its help
Rear Brakes JC3
Rotor Discard Thickness*
18.50 mm/0.728 in
Rotor Minimum Allowable Thickness After Refinish
19.0 mm/0.748 in
Rotor Thickness (new)
20.0 mm/0.787 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in Rear Brakes JC4
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring1
.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in Rear Brakes JH2
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in Rear Brakes JH6
Rotor Discard Thickness*
27.50 mm/1.082 in
Rotor Minimum Allowable Thickness After Refinish
28.0 mm/1.102 in
Rotor Thickness (new)
29.0 mm/1.141 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in Rear Brakes JH7
Rotor Discard Thickness*
28.5 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in * All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this Specification. After refinishing the rotor, replace any rotor that does not meet the minimum or discard thickness specifications.
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